CN211128734U

CN211128734U - Busbar capacitor assembly heat dissipation device and electric automobile driving motor controller

Info

Publication number: CN211128734U
Application number: CN201921670622.XU
Authority: CN
Inventors: 邵兆军; 郑鑫
Original assignee: Suzhou Huichuan United Power System Co Ltd
Current assignee: Suzhou Huichuan United Power System Co Ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-07-28
Anticipated expiration: 2029-10-08

Abstract

The embodiment of the utility model provides a female electric capacity subassembly heat abstractor and electric automobile driving motor controller of arranging, female electric capacity subassembly of arranging includes electric capacity and is connected to female the arranging of stromatolite of electric capacity, female the arranging of stromatolite is including overlapping P-N copper bar and the output copper bar that sets up mutually, just female the arranging of stromatolite is passed through P-N copper bar is connected to the inside copper bar of electric capacity, heat abstractor includes first radiating piece and second radiating piece, just first radiating piece does through the contact heat transfer mode P-N copper bar heat dissipation, the second radiating piece does through the contact heat transfer mode output copper bar heat dissipation. The embodiment of the utility model provides a through first radiating piece and second radiating piece use the contact heat transfer mode to arrange the heat dissipation for the stromatolite is female, reduced female temperature of arranging electric capacity subassembly self, promoted female row's current-carrying density of stromatolite.

Description

Busbar capacitor assembly heat dissipation device and electric automobile driving motor controller

Technical Field

The utility model relates to a controller field, more specifically say, relate to a female capacitor assembly heat abstractor and electric automobile driving motor controller of arranging.

Background

Generally, the protection level of the electric vehicle controller needs to reach IP67 level, and the internal structure layout of the electric vehicle controller is compact, and the external installation environment is severe (the environmental temperature often reaches 85 ℃). Due to the structure with high ring temperature, high integration and high power density, the heat dissipation condition of parts such as a busbar and a capacitor in the electric automobile controller is poor, and the temperature rise is high.

As shown in fig. 1, the bus bar capacitor assembly is a schematic view of a heat dissipation structure of a common bus bar capacitor assembly at present, and the bus bar capacitor assembly includes a capacitor 11 and a laminated bus bar 12 connected to the capacitor 11, and the heat dissipation form of the bus bar capacitor assembly is natural heat dissipation in a sealed cavity 10 (i.e., a controller housing), mainly taking a surface natural convection and heat radiation manner as a main mode, and having a large thermal resistance between a heat source and a heat sink, which results in a high temperature rise of the capacitor 11 and the laminated bus bar 12.

For the copper bar 12, on one hand, the high current-carrying density may cause the temperature of the laminated busbar 12 itself to be very high, and affect the use of other elements, such as hall, plastic part, contactor, etc., in contact with the laminated busbar 12; on the other hand, the heat emitted by the laminated busbar 12 is accumulated in the controller, so that the ambient temperature in the controller is increased, and the heat radiation of components such as a circuit board and the like is indirectly influenced.

For the capacitor 11, the electric core is packaged inside the capacitor plastic shell, and no matter the plastic shell, the electric core or the potting adhesive is low in heat conductivity coefficient, so that the temperature difference between the electric core as a heat source and the external heat sink is large, and the heat dissipation of the capacitor 11 is directly influenced.

As shown in fig. 2, it is a temperature cloud diagram of the conventional controller busbar capacitor assembly under a natural heat dissipation condition (the ambient temperature around the controller is set to be 85 ℃), and it can be known from the diagram that the overall temperature of the busbar capacitor assembly is high, the temperature of the P-N copper bars 121 in the laminated busbar 12 is about 13 ℃ (the P-N copper bars 121 include a positive copper bar for connecting the positive electrode of the capacitor 11 and a negative copper bar for connecting the negative electrode of the capacitor 11), the temperature of the output copper bar 122 is about 161 ℃, and the temperature above the capacitor 11 is about 124 ℃.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a to above-mentioned female capacitor assembly that arranges only lead to electric capacity and the female problem of the use of arranging other elements of the female contact of arranging of stromatolite higher, influence through natural heat dissipation, provide a female capacitor assembly heat abstractor and electric automobile driving motor controller of arranging.

The embodiment of the utility model provides a solve above-mentioned technical problem's technical scheme is, provide a female capacitor assembly heat abstractor that arranges, female the arranging capacitor assembly includes electric capacity and is connected to female the arranging of stromatolite of electric capacity, female the arranging of stromatolite is including overlapping P-N copper bar and the output copper bar that sets up mutually, just female the arranging of stromatolite is passed through P-N copper bar is connected to the inside copper bar of electric capacity, heat abstractor includes first radiating piece and second radiating piece, just first radiating piece does through the contact heat transfer mode P-N copper bar heat dissipation, the second radiating piece does through the contact heat transfer mode output copper bar heat dissipation.

Preferably, the first heat dissipation member and the second heat dissipation member are independent of each other, the busbar capacitor assembly is installed in the metal casing, the first heat dissipation member is composed of a heat conduction boss in contact with the metal casing, and the heat conduction boss is in heat conduction contact with the P-N copper bar through a first heat conduction insulating medium layer.

Preferably, the second heat dissipation part is a liquid cooling radiator, the liquid cooling radiator comprises a first heat dissipation surface, the first heat dissipation surface is in heat conduction contact with the output copper bar through a second heat conduction insulating medium layer, and a liquid inlet and a liquid outlet of the liquid cooling radiator are both located outside the metal shell.

Preferably, the liquid-cooled heat sink is integral with the metal chassis.

Preferably, the capacitor is fixed on the bottom plate of the metal chassis, and the laminated busbar is parallel to the bottom plate of the metal chassis; the liquid cooling radiator is located between the output copper bar and the bottom plate of the metal casing.

Preferably, the liquid-cooled heat sink includes a second heat dissipation surface, and the second heat dissipation surface is in heat-conducting contact with the bottom plate of the metal case.

Preferably, the heat conduction boss is integrated with the metal casing, and a gap between the heat conduction boss and the capacitor is smaller than 10 mm.

Preferably, one end of the P-N copper bar, which is far away from the capacitor, is stacked above the output copper bar, and the first heat dissipation member and the second heat dissipation member are respectively located below the stacked busbar.

Preferably, the laminated busbar, the first heat dissipation member and the second heat dissipation member are located on the same side of the capacitor, and the first heat dissipation member is located between the capacitor and the second heat dissipation member.

The embodiment of the utility model provides an electric automobile driving motor controller is still provided, include the metal casing and install female electric capacity subassembly of arranging in the metal casing, electric automobile driving motor controller still includes as above arbitrary the female electric capacity subassembly heat abstractor that arranges.

The utility model discloses female capacitor assembly heat abstractor and electric automobile driving motor controller of arranging has following beneficial effect: the first heat dissipation piece and the second heat dissipation piece dissipate heat for the laminated busbar in a contact heat transfer mode, the temperature of the busbar capacitor assembly is reduced, and the current-carrying density of the laminated busbar is improved. And, the embodiment of the utility model provides an in first radiating piece and second radiating piece still can be with the heat conduction that female electric capacity subassembly produced outside airtight cavity to reduce inside heat and pile up, improved the heat dissipation condition of inside other components and parts, promoted the reliability of inside each components and parts.

Drawings

Fig. 1 is a schematic structural diagram of a conventional busbar capacitor assembly;

FIG. 2 is a temperature cloud diagram of a conventional electric vehicle driving motor controller busbar capacitor assembly under a natural heat dissipation condition;

fig. 3 is a schematic structural diagram of a heat dissipation device for a busbar capacitor assembly according to an embodiment of the present invention;

fig. 4 is a temperature cloud chart of the busbar capacitor assembly after the busbar capacitor assembly heat dissipation device provided by the embodiment of the invention is used;

fig. 5 is a schematic structural diagram of a drive motor controller of an electric vehicle according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 3, the embodiment of the present invention provides a schematic diagram of a heat dissipation device for a bus bar capacitor assembly, wherein the bus bar capacitor assembly can be installed in a controller of a driving motor of an electric vehicle or other controllers of driving motors, and supplies power to each element (e.g., hall, contactor, etc.) in the controller. The busbar capacitor assembly specifically comprises a capacitor 31 and a laminated busbar connected to the capacitor 31, wherein the capacitor 31 can be connected to a direct current bus and realizes the functions of energy storage, filtering and the like; the laminated busbar comprises a P-N copper bar 321 and an output copper bar 322, and the P-N copper bar 321 and the output copper bar 322 are arranged in an overlapped mode. The laminated busbar is connected to the inner copper bar 311 of the capacitor 31 through the P-N copper bar 321. The heat dissipation device of the busbar capacitor assembly in the embodiment includes a first heat dissipation member 33 and a second heat dissipation member 34, and the first heat dissipation member 33 dissipates heat for the P-N copper bar 321 in a contact heat transfer manner, that is, the first heat dissipation member 33 is in direct or indirect contact with the P-N copper bar 321 to realize heat transfer; the second heat dissipation member 34 dissipates heat for the output copper bar 322 in a contact heat transfer manner, that is, the second heat dissipation member 34 directly or indirectly contacts the output copper bar 322 to realize heat transfer.

Through the heat dissipation device for the busbar capacitor assembly, heat generated by current flowing through the laminated busbar can be taken away through the second heat dissipation part 34, heat generated by the battery core of the capacitor 31 is conducted to the P-N copper bar 321 through the internal copper bar 311, and then taken away through the first heat dissipation part 33 (partial heat is conducted to the output copper bar 322 through the P-N copper bar 321 and then taken away by the second heat dissipation part 34), so that the heat cannot be accumulated on the laminated busbar, and the temperature rise of the laminated busbar and the capacitor 31 can be remarkably improved.

The heat dissipation device of the busbar capacitor assembly is used for dissipating heat of the laminated busbar in a contact heat transfer mode through the first heat dissipation piece 33 and the second heat dissipation piece 34, the temperature of the busbar capacitor assembly is reduced, and the current-carrying density of the laminated busbar is improved, so that the use of other elements in contact with the laminated busbar, such as a Hall element, a plastic part, a contactor and the like, is not influenced.

In an embodiment of the present invention, the first heat dissipating element 33 and the second heat dissipating element 34 are independent of each other, and the bus bar capacitor assembly is installed in the metal casing 30, the first heat dissipating element 33 can be formed by a heat conducting boss contacting with the metal casing 30, and the heat conducting boss is in heat conducting contact with the P-N copper bar 321 through the first heat conducting insulating medium layer 35. The first heat-conducting insulating medium layer 35 has certain elasticity, so that the phenomenon that the heat resistance is large due to the gap between the heat-conducting boss and the P-N copper bar 321 can be avoided, and the contact heat transfer efficiency between the heat-conducting boss and the P-N copper bar 321 is improved. When the busbar capacitor assembly works, heat generated by the battery core of the capacitor 31 is conducted to the P-N copper bars 321 through the internal copper bars 311, and part of the heat is conducted to the heat-conducting bosses through the first heat-conducting insulating medium layer 35, so that the heat of the heat-conducting bosses can be discharged out of the sealed cavities in the metal case 30 through the metal case 30 because the metal case 30 has better contact heat transfer performance.

Preferably, the heat-conducting boss may be integrated with the metal chassis 30, thereby facilitating the assembly of the entire controller while improving the contact heat transfer efficiency between the heat-conducting boss and the metal chassis 30. Moreover, the gap between the heat-conducting boss and the capacitor 31 can be smaller than 10mm, so that the radiation path of heat generated by the capacitor 31 is shortened, and partial heat radiated by the capacitor 31 is taken away through the heat-conducting boss.

In another embodiment of the present invention, the second heat sink 34 can be a liquid cooling heat sink, which includes a first heat dissipating surface, and the first heat dissipating surface is in heat-conducting contact with the output copper bar 322 through the second heat-conducting insulating medium layer 36, and the liquid inlet and the liquid outlet of the liquid cooling heat sink are both located outside the metal casing 30. After the liquid inlet and the liquid outlet of the liquid cooling radiator are connected to the external cooling liquid pipeline, the heat generated by the current flowing through the output copper bar 322 and part of the heat from the P-N copper bar 321 are conducted to the first heat dissipation surface of the liquid cooling radiator through the second heat-conducting insulating medium layer 36, and finally taken away by the cooling liquid flowing through the liquid cooling radiator 6. And because the liquid inlet and the liquid outlet of the liquid cooling radiator are both positioned outside the metal casing 30, the connection of the liquid cooling radiator and an external cooling liquid pipeline is convenient. Of course, the second heat dissipation element 34 may also be formed by other heat sinks, for example, the second heat sink 34 may also be a heat conduction boss connected to the metal casing 30, but the heat dissipation effect is relatively poor.

Through heat conduction boss and liquid cooling radiator, can be with arranging outside the sealed cavity of capacitor assembly production with female heat conduction to metal casing 30 fast to reduce the inside heat of sealed cavity and piled up, improved the heat dissipation condition of other components and parts inside the sealed cavity, promoted the reliability of each components and parts inside the sealed cavity.

In addition, in order to quickly dissipate the heat in the metal casing 30, the liquid-cooled heat sink may further include a second heat dissipating surface in heat-conducting contact with the bottom plate or the side wall of the metal casing 30, so that the heat in the metal casing 30 may be quickly dissipated by the cooling liquid flowing through the liquid-cooled heat sink, thereby further improving the temperature environment in the sealed cavity of the metal casing 30.

In particular, the liquid-cooled heat sink can be integrated with the metal housing 30, which simplifies the assembly of the liquid-cooled heat sink and improves the sealing effect of the metal housing 30.

In an embodiment of the present invention, the capacitor 31 of the busbar capacitor assembly may be fixed on the bottom plate 301 of the metal casing 30, and the laminated busbar is parallel to the bottom plate 301 of the metal casing 30; accordingly, the liquid-cooled heat sink is located between the output copper bar 322 and the bottom plate 301 of the metal chassis 30. This configuration facilitates mounting of the busbar capacitor assembly and the liquid-cooled heat sink to the metal chassis 30.

One end of the P-N copper bar 321, which is far away from the capacitor 31, is stacked above the output copper bar 322, and the first heat dissipation member 33 and the second heat dissipation member 34 are respectively located below the stacked bus bar. In addition, the laminated busbar, the first heat dissipation element 33 and the second heat dissipation element 34 may be located on the same side of the capacitor 31, and the first heat dissipation element 33 is located between the capacitor 31 and the second heat dissipation element 34. The above structure also facilitates the layout, installation and fixation of the busbar capacitor assembly, the first heat dissipation member 33 and the second heat dissipation member 34.

As shown in fig. 4, for using the utility model provides a female temperature cloud picture of arranging capacitor assembly behind female capacitor assembly heat abstractor (supposing that the outside ambient temperature of metal casing is 85 ℃, the temperature of the casing of liquid cooling radiator is 75 ℃), can see from this picture that female arranging capacitor assembly bulk temperature is lower, and the temperature of P-N copper bar 321 is about 86 ℃, and the temperature of output copper bar 322 is about 102 ℃, and the temperature of electric capacity 31 top is about 96 ℃, and the heat dissipation optimization effect is obvious.

As shown in fig. 5, the embodiment of the utility model provides an still provides an electric automobile driving motor controller, and this controller is used for electric automobile driving motor control, and this electric automobile driving motor controller includes inclosed metal casing and installs female electric capacity subassembly of arranging in the metal casing and as above female electric capacity subassembly heat abstractor that arranges first radiating piece and the second radiating piece among the female electric capacity subassembly accessible heat abstractor of arranging realize dispelling the heat fast, avoid the heat to pile up.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a female capacitor assembly heat abstractor that arranges, female capacitor assembly that arranges includes electric capacity and is connected to female the arranging of stromatolite of electric capacity, female the arranging of stromatolite is including overlapping P-N copper bar and the output copper bar that sets up mutually, just female the arranging of stromatolite is connected to the inside copper bar of electric capacity through P-N copper bar, its characterized in that, heat abstractor includes first radiating part and second radiating part, just first radiating part does through the contact heat transfer mode P-N copper bar heat dissipation, the second radiating part does through the contact heat transfer mode output copper bar heat dissipation.

2. The heat dissipation device for the busbar capacitor assembly according to claim 1, wherein the first heat dissipation member and the second heat dissipation member are independent from each other, the busbar capacitor assembly is mounted in a metal case, the first heat dissipation member is formed by a heat conduction boss in contact with the metal case, and the heat conduction boss is in heat conduction contact with the P-N copper bar through a first heat conduction insulating medium layer.

3. The heat dissipation device for the busbar capacitor assembly according to claim 2, wherein the second heat dissipation member is a liquid-cooled heat sink, the liquid-cooled heat sink includes a first heat dissipation surface, the first heat dissipation surface is in heat-conducting contact with the output copper bar through a second heat-conducting insulating medium layer, and both the liquid inlet and the liquid outlet of the liquid-cooled heat sink are located outside the metal casing.

4. The busbar capacitor assembly heat sink of claim 3, wherein said liquid-cooled heat sink is integral with said metal chassis.

5. The heat sink for busbar capacitor assembly according to claim 3, wherein the capacitor is fixed on the bottom plate of the metal chassis, and the laminated busbar is parallel to the bottom plate of the metal chassis; the liquid cooling radiator is located between the output copper bar and the bottom plate of the metal casing.

6. The heat sink assembly of claim 5, wherein the liquid-cooled heat sink comprises a second heat dissipating surface, and wherein the second heat dissipating surface is in thermally conductive contact with the bottom plate of the metal chassis.

7. The busbar capacitor assembly heat sink of claim 2, wherein the thermally conductive boss is integral with the metal chassis.

8. The heat dissipation device for the busbar capacitor assembly according to claim 1, wherein one end of the P-N copper bar, which is away from the capacitor, is stacked above the output copper bar, and the first heat dissipation member and the second heat dissipation member are respectively located below the stacked busbar.

9. The busbar capacitor assembly heat sink of claim 8, wherein the laminated busbar, the first heat sink, and the second heat sink are located on the same side of the capacitor, and the first heat sink is located between the capacitor and the second heat sink.

10. An electric vehicle driving motor controller, comprising a metal casing and a busbar capacitor assembly mounted in the metal casing, characterized in that the electric vehicle driving motor controller further comprises a busbar capacitor assembly heat sink according to any one of claims 1 to 9.